You know better than to believe everything companies say in ads, but when it comes to claims about the healthfulness of foods and other products, the untruths can reach outrageous levels. The question is: What can a government limited by the First Amendment do to stop them?

The CEO of the Coca-Cola, the world's largest beverage company, still believes the U.S. is "a great market for growth." Says Muhtar Kent: "We believe that everything that we've done to course-correct in the U.S. in the last three years is working."